T206 Blank Back are amongst the rarest......there are only single confirmed examples or "twins" at the most in T206(mostly southern league)......and, only 1/4 of the players approx. have been confirmed!
I love that they have flown under the radar for so many years.....they aren't even "issued cards"
I hate pointing this out, cause it ultimately makes what I'm chasing almost impossible to get, happened with scrap to me....and bb's are scrap also...